Here is the tutorial for your reference to extract data from iPad, you can have a try of it:
Restore iPad data from backup files, with the help of iPad Data Extractor:
1. Settings>General>Reset>Erase all content and settings
2. You'll be asked twice to confirm
3. You'll see Apple logo and progress bar
4. You'll see a big iPad logo on screen
5. Configuration start
6. Set language
7. Set country
8. Select Network and input Password>Join
9. Enable Location Service>Next
10. You'll be given 3 options (a) Setup as New iPad (b) Restore from iCloud Backup (c)